Imnaha, Oregon · field elev 6,708 ft
Density Altitude at Memaloose Usfs (25U)
Memaloose Usfs is a genuine high-and-hot field: from 6,708 ft of elevation, a typical July afternoon (79 °F) pushes density altitude to about 9,483 ft — the airplane performs like it is 2,775 ft above the field before the wheels roll.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 21.1 | 5,790 ft | 35.0 | 6,722 ft ▲ |
| February | 24.0 | 5,988 ft | 40.8 | 7,101 ft ▲ |
| March | 31.5 | 6,491 ft | 45.7 | 7,418 ft ▲ |
| April | 35.1 | 6,729 ft | 49.8 | 7,679 ft ▲ |
| May | 43.3 | 7,263 ft | 59.3 | 8,276 ft ⚠ |
| June | 51.1 | 7,762 ft | 68.1 | 8,817 ft ⚠ |
| July | 58.0 | 8,195 ft | 79.2 | 9,483 ft ⚠ |
| August | 56.9 | 8,126 ft | 78.9 | 9,465 ft ⚠ |
| September | 49.4 | 7,654 ft | 69.2 | 8,883 ft ⚠ |
| October | 39.4 | 7,010 ft | 56.0 | 8,070 ft ⚠ |
| November | 28.7 | 6,304 ft | 41.2 | 7,127 ft ▲ |
| December | 21.6 | 5,825 ft | 34.1 | 6,663 ft ▲ |
▲ above 5,000 ft · ⚠ above 8,000 ft. These are planning references at standard pressure and dry air — afternoon humidity and low pressure both push the real number higher. Run today's values below.
Run today’s numbers for 25U
DENSITY ALTITUDE high DA
Field elevation 6,708 ft — the air behaves like 9,471 ft.
- PRESSURE ALT
- 6,710 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
- —
- AIR DENSITY
- —
- WATER · GRAINS/LB
- —
For training and reference · verify with official sources and your POH before flight · no tool on this site renders a go / no-go judgment
Nearby Oregon fields
- O68 — Sluice Creek
Imnaha · elev 1,370 ft
- OR9 — Lord Flat Usfs
Imnaha · elev 5,594 ft
- O29 — Pittsburg Landing
Imnaha · elev 1,185 ft
- OR8 — Dug Bar Usfs
Imnaha · elev 1,022 ft
- KJSY — Joseph State
Joseph · elev 4,126 ft
- O62 — B & H Usfs
Enterprise · elev 4,007 ft
- 8S4 — Enterprise Municipal
Enterprise · elev 3,957 ft
- O48 — Salmon Bar
Imnaha · elev 947 ft
Frequently asked questions
How high does density altitude get at 25U in summer?
On a typical July afternoon — around 79 °F at the nearest NOAA normals station — density altitude at Memaloose Usfs reaches roughly 9,483 ft at standard pressure. Hotter-than-normal days, low pressure, and humidity all push it higher, so run the day's actual numbers before flying.
What is the density altitude at 25U on an average day?
It swings with the seasons: from roughly 5,790 ft at the coldest month's average temperature to about 8,195 ft at the warmest month's — all from a constant field elevation of 6,708 ft. The month-by-month table above carries the full year.
What is the field elevation of Memaloose Usfs?
6,708 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 25U (FAA), in Imnaha, Oregon.